feat: implement backend API for Pantree Phase 1 MVP

- Project setup: package.json, tsconfig.json, jest.config.js, .env.example
- Config: env.ts, constants.ts (ALLOWED_UNITS, bcrypt rounds, JWT, deletion windows)
- DB: Knex connection, knexfile, migrations 001-006 (users, password_reset_tokens,
  pantry_items, recipes+recipe_ingredients, shopping_lists+items, deleted_records)
- Seeds: 10 seeded recipes with full ingredient lists
- Middleware: JWT authMiddleware (validates token + user existence), errorHandler
- Utils: Pino logger, JWT sign helper, Zod validators for all request shapes
- Services: authService (signup/signin/google/pwd-reset/soft-delete/restore),
  pantryService (CRUD + case-insensitive duplicate guard),
  recipeService (browse+filter+scale), shoppingListService (CRUD+merge logic),
  syncService (delta sync + tombstone cleanup), emailService (SendGrid)
- Routes: /v1/auth, /v1/pantry, /v1/recipes, /v1/shopping-lists, /v1/sync
- App: Express factory (createApp), server entry point
- Jobs: node-cron daily hard-delete + tombstone cleanup
- Tests: validators, utils, auth, pantry, recipes, shopping lists, sync

src/routes/recipes.ts

@@ -0,0 +1,31 @@
+import { Router, Response, NextFunction } from 'express';
+import { authMiddleware, AuthenticatedRequest } from '../middleware/auth';
+import { recipeService } from '../services/recipeService';
+import { recipeQuerySchema, recipeDetailQuerySchema } from '../utils/validators';
+
+const router = Router();
+router.use(authMiddleware);
+
+// GET /recipes
+router.get('/', async (req: AuthenticatedRequest, res: Response, next: NextFunction) => {
+  try {
+    const { filter, page, limit, search } = recipeQuerySchema.parse(req.query);
+    const result = await recipeService.getRecipes(req.userId!, filter, page, limit, search);
+    res.status(200).json({ ...result, synced_at: new Date().toISOString() });
+  } catch (err) {
+    next(err);
+  }
+});
+
+// GET /recipes/:recipe_id
+router.get('/:recipe_id', async (req: AuthenticatedRequest, res: Response, next: NextFunction) => {
+  try {
+    const { scale } = recipeDetailQuerySchema.parse(req.query);
+    const recipe = await recipeService.getRecipeById(req.params.recipe_id, req.userId!, scale);
+    res.status(200).json({ recipe });
+  } catch (err) {
+    next(err);
+  }
+});
+
+export default router;